ESD-detector
The invention relates to a method for reducing the adverse effects of electrostatic discharge events occurring in a handheld device. The invention involves the steps of enabling a detector for detection of an electrostatic discharge event in the handheld device, detecting the electrostatic discharge event which has affected the handheld device, generating an event signal in response to the electrostatic discharge event, and applying the event signal to the detector, retrieving status information from circuits and components in the handheld device, analysing the event signal and the status information, and taking an action based on the analysis to mitigate any adverse effects of the detected electrostatic discharge event.
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The present invention relates in general to a method for detecting an electrostatic discharge event in an electronic device, such as a mobile communication device, and to help the electronic device to recover from any adverse effects induced by the electrostatic discharge event.
BACKGROUND ARTThe effect of electrostatic charging has been recorded throughout history. For example, the ancient Greeks noted that when amber was rubbed with cat's fur it started to attract small pieces of almost any light weighted material. Since then we have learned much about this phenomenon, and today electrostatic charging is used in a wide variety of products ranging from laser printers to air cleaners. However, we have also learned that a large build-up of electrostatic charges followed by an uncontrolled discharge, also known as an electrostatic discharge (ESD) event, may severely damage an electronic device.
The generation of an ESD event is mainly due to either triboelectrification or induction charging. Triboelectrification, or tribocharging, occurs when two materials are brought into contact and then separated, causing a separation of electric charges. Typical examples of tribocharging include walking on a rug with insulated footwear, descending from a car, or rubbing a balloon in the hair. In all these cases, the friction between two materials creates a difference of electrical potential which might lead to an ESD event when the charges object comes into contact with a grounded object.
Induction charging occurs when an electrically charged object is placed in the vicinity of a conductive object which is isolated from ground. The presence of the charged object creates an electrostatic field that causes electrical charges on the surface of the other object to redistribute into regions of excess positive and negative charges. An ESD event may then occur when the object comes into contact with a conductive path. An example of this is for instance when charged regions on the surfaces of a plastic bag induce potential on a nearby electronic component, and when the component is touched with a grounded metallic tool an ESD event occurs.
As mentioned above electronic devices may be damaged by and ESD event. This is due to the fact that modern-day semiconductor devices are very sensitive to ESD, and when subjected to an ESD event the devices may suffer direct, indirect and latent damage. The direct damage results from physical destruction, or degradation, of an electronic part in the device, which makes it unusable. This failure is classified as a hard failure since it is irreversible. An indirect damage is the result of when for instance a device changes its state due to conducted or radiated electromagnetic interference (EMI) sourced by the discharge. This failure is classified as soft failure. A latent damage is when a discharge affects the device which does not show any apparent damage but with time causes a hard failure to occur. Because of the increase in use of semiconductor devices in every aspect of life, it has become an important issue to protect electronic devices as much as possible from damage or malfunction due to ESD.
The most common ways of minimizing the effects of an ESD event on an electronic device is to either add protective circuitry, apply shielding to ESD sensitive circuitry in the device, or to construct an elaborate ground system which can dissipate the high transient currents generated during an ESD event. Although these precautions may protect the device from suffering hard failures, soft failures resulting in erroneous behaviour or hang-ups of the device may still occur due to the EMI generated by discharges.
SUMMARY OF THE INVENTIONWith the above description in mind, then, an aspect of some embodiments of the present invention is to provide an ESD-detector consisting of detector circuitry and a detector antenna, which seeks to mitigate, alleviate or eliminate one or more of the above-identified deficiencies in the art and disadvantages singly or in any combination.
An aspect of the present invention relates to a method for mitigating effects of electrostatic discharge events occurring in a handheld device, comprising the steps of enabling detector for detection of an electrostatic discharge event in said handheld device, detecting said electrostatic discharge event effecting said handheld device, generating an event signal in response to said detected electrostatic discharge event, retrieving status information from circuits and components in said handheld device, analysing said event signal and said status information, and taking an action in said handheld device based on said analysis.
The method may also comprise an action which comprises a restart of said handheld device.
The method may also comprise an action which comprises a restart of effected circuits and components determined by said analysis.
The method may also comprise an action comprised to not taking an action.
The method may also comprise a detecting step which uses a detector comprising a detector circuitry and a detector antenna.
The method may also comprise a detecting step which uses a detector antenna comprising at least one loop antenna.
The method may also comprising a detecting step which uses a detector antenna comprise at least one monopole antenna.
The method may also comprising a detecting step which uses a detector antenna comprise of a combination of at least one loop antenna and at least one monopole antenna.
The method may also comprise retrieval of status information which also comprises the step of storing said status information in a memory.
The method may also comprise an analysis which is also based on said stored status information.
The method may also comprise the generation of an event signal which is determined by either a pre-defined threshold value or a user-defined threshold value.
The method may also comprise an action which also comprises the step of storing information about the action in a memory.
The method may also comprise an analysis which is also based on said stored information about previous actions taken.
The method may also comprise a generation of event signal which also comprise the step of storing the occurrence of an event signal in a memory to be used for statistical purposes.
The method may also comprise a detecting step which uses a detector antenna which comprising one or more detector antenna structures, wherein a detector antenna structure may either be an etched trace on a printed circuit board, a conducting wire, or other conducting antenna element.
Another aspect of the present invention relates to an arrangement for mitigating effects of electrostatic discharge events occurring in a handheld device, the arrangement comprising means for enabling detector for detection of an electrostatic discharge event in said handheld device, means for detecting said electrostatic discharge event effecting said handheld device, means for generating an event signal in response to said detected electrostatic discharge event, means for retrieving status information from circuits and components in said handheld device, means for analysing said event signal and said status information, and means for taking an action in said handheld device based on said analysis.
The arrangement may also comprise means for restarting said handheld device.
The arrangement may also comprise means for restarting effected circuits and components determined by said analysis.
The arrangement may have a detector which is comprised of detector circuitry and a detector antenna.
The arrangement may have a detector antenna which is comprised of at least one loop antenna.
The arrangement may have a detector antenna which is comprised of at least one monopole antenna.
The arrangement may have a detector antenna which is comprised of a combination of at least one loop antenna and at least one monopole antenna.
The arrangement may have means for retrieving status information which also may comprise means for storing said status information in a memory.
The arrangement may have means for analysis which also may further comprises the means for retrieving stored status information from memory.
The arrangement may have means for generation of an event signal which may comprise means for setting a pre-defined threshold value or a user-defined threshold value.
The arrangement may have means for action which also may comprise the means for storing information about the action in a memory.
The arrangement may have means for analysis which also may further comprise the means for retrieving stored information about previous actions taken.
The arrangement may have means for generation of event signal which also may comprise the means for storing the occurrence of an event signal in a memory to be used for statistical purposes.
The arrangement may have a detector antenna comprised of one or more detector antenna structures, wherein the detector antenna structure may either be a etched trace on a printed circuit board, a conducting wire, or other conducting antenna element.
The features of the above-mentioned embodiments can be combined in any combinations.
Further objects, features and advantages of the present invention will appear from the following detailed description of the invention, wherein embodiments of the invention will be described in more detail with reference to the accompanying drawings, in which:
Embodiments of the present invention relate, in general, to the field of detection of electrostatic discharge events, in electronic devices, and the mitigating of any adverse effects thereof. A preferred embodiment relates to a portable communication device, such as a mobile phone, including one or more input devices. However, it should be appreciated that the invention is as such equally applicable to electronic devices which do not include any radio communication capabilities. However, for the sake of clarity and simplicity, most embodiments outlined in this specification are related to mobile phones.
Embodiments of the present invention will hereinafter be described in more detail with reference to the accompanying drawings, in which embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference signs refer to like elements throughout.
As discussed in the background art, an ESD event may induce a soft failure in an electronic device such as a mobile phone. Soft failures often result in temporary malfunction of the device, such as a hang-up or a freeze, which disappears after a restart (power off-power on) of the device. However, in many cases a complete restart of the device is unnecessary since the soft failure often only affects a specific electronic part in the device, which in many cases can be restarted separately without restarting the entire device. The present invention describes an ESD-detector that is capable of detecting an ESD event and determine if the device needs to be completely restarted or if only one or more electronic parts in the device needs to be restarted. In this way user avoid the often unnecessary and cumbersome process of restarting the entire device.
If other devices are added to the main device, such as an add-on camera unit added to a mobile phone, it is possible that only the external unit may be affected by an ESD event. To be able to detect problems due to ESD events in external units, it is possible to integrate antennas (monopole or loop antennas) in the external unit as well. The detector antenna in the external unit may then be connected to the detector circuitry 415 via the external antenna connectors 413 as shown in
The antenna structures presented in the embodiments above may be implemented in virtually any shape, size or combination (loop—monopole, several loops, several monopoles structures), as long as they present loop- and monopole antenna characteristics, and consequently are useful to determine the occurrence of an ESD event. The antenna structure may also be implemented using wires or any other antenna element, instead of or in combination with etched leads on a PCB.
Several embodiments describing the functionality of the ESD-detector will now be discussed using flowcharts.
The detection of an ESD event may be indicated to a user by displaying a message, indicating via a special ESD icon, playing an audio signal, vibrating the device, or a combination thereof.
The device/component restart operation, discussed in the embodiments above, may either be implemented in software or in hardware, or a combination of both. The hardware and/or the software implementation can either be contained in the ESD-detector circuitry and/or in other components in the device, such as in dedicated circuitry and/or in the devices processor and memory. The circuitry that performs the restart operations may determine which component(s) that need to be restarted, in what sequence they may need to be restarted, and how long any reset signals have to last. If the restart operation is implemented in standalone hardware, it can be made to operate completely autonomous from the rest of the device, which may be beneficial in comparison to a software implementation which could stop operating when key components in the device are affected. During the restart operation a message may be displayed to the user, informing the user that a restart operation is in progress.
In another embodiment the ESD-detector may be implemented in a passive state where the user is able to turn the ESD-detector on or off by choice. In this way the user can decide when to use the detector and when to turn it off, to for instance save power.
In yet another embodiment the ESD-detector may include a memory which record statistics regarding the number and the severity of the ESD events which the device is subjected to. The statistics may be used in several different ways such as a basis for determining latent ESD problems with a specific device model, as a basis for when an ESD-detector in a passive mode should be switched on/off, or as statistical data which together with stored information about previous actions taken may be a basis for the decision making when a new action is going to be taken.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” “comprising,” “includes” and/or “including” when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The foregoing has described the principles, preferred embodiments and modes of operation of the present invention. However, the invention should be regarded as illustrative rather than restrictive, and not as being limited to the particular embodiments discussed above. The different features of the various embodiments of the invention can be combined in other combinations than those explicitly described. It should therefore be appreciated that variations may be made in those embodiments by those skilled in the art without departing from the scope of the present invention as defined by the following claims.
Claims
1. A method for mitigating effects of electrostatic discharge events occurring in a handheld device, comprising the steps of:
- enabling detector for detection of an electrostatic discharge event in said handheld device;
- detecting said electrostatic discharge event effecting said handheld device;
- generating an event signal in response to said detected electrostatic discharge event;
- retrieving status information from circuits and components in said handheld device;
- analysing said event signal and said status information; and
- taking an action in said handheld device based on said analysis.
2. The method according to claim 1, wherein said action comprises a restart of said handheld device.
3. The method according to claim 1, wherein said action comprises a restart of effected circuits and components determined by said analysis.
4. The method according to claim 1, wherein said action comprises not taking an action.
5. The method according to claim 1, wherein said detecting step uses a detector comprising a detector circuitry and a detector antenna.
6. The method according to claim 5, wherein said detecting step uses a detector antenna comprising at least one loop antenna.
7. The method according to claim 5, wherein said detecting step uses a detector antenna comprising at least one monopole antenna.
8. The method according to claim 5, wherein said detecting step uses a detector antenna comprising a combination of at least one loop antenna and at least one monopole antenna.
9. The method according to claim 1, wherein said retrieval of status information also comprises the step of storing said status information in a memory.
10. The method according to claim 9, wherein said analysis is also based on said stored status information.
11. The method according to claim 1, wherein said generation of an event signal is determined by either a pre-defined threshold value or a user-defined threshold value.
12. The method according to claim 1, wherein said action also comprise the step of storing information about the action in a memory.
13. The method according to claim 12, wherein said analysis is also based on said stored information about previous actions taken.
14. The method according to claim 1, wherein said generation of event signal also comprise the step of storing the occurrence of an event signal in a memory to be used for statistical purposes.
15. The method according to claim 5, wherein said detecting step uses a detector antenna comprising one or more detector antenna structures, wherein a detector antenna structure may either be a etched trace on a printed circuit board, a conducting wire, or other conducting antenna element.
16. A portable communication device comprising an arrangement for mitigating effects of electrostatic discharge events occurring in a handheld device, the arrangement comprising:
- means for enabling detector for detection of an electrostatic discharge event in said handheld device;
- means for detecting said electrostatic discharge event effecting said handheld device;
- means for generating an event signal in response to said detected electrostatic discharge event;
- means for retrieving status information from circuits and components in said handheld device;
- means for analysing said event signal and said status information; and
- means for taking an action in said handheld device based on said analysis.
17. The arrangement according to claim 16, comprises means for restarting said handheld device.
18. The arrangement according to claim 16, comprises means for restarting effected circuits and components determined by said analysis.
19. The arrangement according to claim 16, wherein said detector comprise a detector circuitry and a detector antenna.
20. The arrangement according to claim 19, wherein said detector antenna comprise at least one loop antenna.
21. The arrangement according to claim 19, wherein said detector antenna comprise at least one monopole antenna.
22. The arrangement according to claim 19, wherein said detector antenna comprise a combination of at least one loop antenna and at least one monopole antenna.
23. The arrangement according to claim 16, wherein said means for retrieving of status information also comprises the means for storing said status information in a memory.
24. The arrangement according to claim 23, wherein said means for analysis further comprises the means for retrieving stored status information from the memory.
25. The arrangement according to claim 16, wherein said means for generation of an event signal comprise means for setting a pre-defined threshold value or a user-defined threshold value.
26. The arrangement according to claim 16, wherein said means for action also comprise the means for storing information about the action in a memory.
27. The arrangement according to claim 26, wherein said means for analysis comprise means for retrieving stored information about previous actions taken.
28. The arrangement according to claim 16, wherein said means for generation of event signal comprise the means for storing the occurrence of an event signal in a memory to be used for statistical purposes.
29. The arrangement according to claim 19, wherein said detector antenna comprise one or more detector antenna structures, wherein the detector antenna structure may either be a etched trace on a printed circuit board, a conducting wire, or other conducting antenna element.
Type: Application
Filed: Feb 5, 2008
Publication Date: Aug 6, 2009
Patent Grant number: 7821751
Applicant: SONY ERICSSON MOBILE COMMUNICATIONS AB (Lund)
Inventor: Sven MEJYR (Stockholm)
Application Number: 12/025,831